Credit report nightmare...help

[Nicholas Reyes]

Hello everyone, So I went to a bank to have a pre-approval done and I was denied for serious delinquencies. I had 2 collections on my report which were paid 1 1/2 yrs ago. I also purchased my primary residence about 6 months ago with no issues. my FICO was at 690 during that time. When they ran it this week it dropped to 606. The only changes to my report was a personal loan got paid off. I've never had missed payments on any accounts, my revolving credit accounts are less than 30% balance. I called Equifax to see if there was an error on there end but I was told nothing is wrong. I just don't understand how my credit can drop 80 points by just paying of a personal loan. I thought purchasing my primary residence would increase my score but it had zero affect on it. I am looking for any advice on getting this cleared up. I am ready to start buying property but this is a huge set back that I need to get cleared up. The loan officer also stated he has never seen a score like this in the 40 years he's been doing this.